2 * Support for SATA devices on Serial Attached SCSI (SAS) controllers
4 * Copyright (C) 2006 IBM Corporation
6 * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
24 #include <scsi/sas_ata.h>
25 #include "sas_internal.h"
26 #include <scsi/scsi_host.h>
27 #include <scsi/scsi_device.h>
28 #include <scsi/scsi_tcq.h>
29 #include <scsi/scsi.h>
30 #include <scsi/scsi_transport.h>
31 #include <scsi/scsi_transport_sas.h>
32 #include "../scsi_sas_internal.h"
34 static enum ata_completion_errors
sas_to_ata_err(struct task_status_struct
*ts
)
36 /* Cheesy attempt to translate SAS errors into ATA. Hah! */
39 if (ts
->resp
== SAS_TASK_UNDELIVERED
)
40 return AC_ERR_ATA_BUS
;
42 /* ts->resp == SAS_TASK_COMPLETE */
43 /* task delivered, what happened afterwards? */
45 case SAS_DEV_NO_RESPONSE
:
46 return AC_ERR_TIMEOUT
;
51 return AC_ERR_ATA_BUS
;
54 case SAS_DATA_UNDERRUN
:
56 * Some programs that use the taskfile interface
57 * (smartctl in particular) can cause underrun
58 * problems. Ignore these errors, perhaps at our
63 case SAS_DATA_OVERRUN
:
65 case SAS_DEVICE_UNKNOWN
:
67 return AC_ERR_INVALID
;
72 SAS_DPRINTK("%s: Saw error %d. What to do?\n",
73 __FUNCTION__
, ts
->stat
);
76 case SAS_ABORTED_TASK
:
79 case SAS_PROTO_RESPONSE
:
80 /* This means the ending_fis has the error
81 * value; return 0 here to collect it */
88 static void sas_ata_task_done(struct sas_task
*task
)
90 struct ata_queued_cmd
*qc
= task
->uldd_task
;
91 struct domain_device
*dev
;
92 struct task_status_struct
*stat
= &task
->task_status
;
93 struct ata_task_resp
*resp
= (struct ata_task_resp
*)stat
->buf
;
94 enum ata_completion_errors ac
;
100 dev
= qc
->ap
->private_data
;
102 spin_lock_irqsave(dev
->sata_dev
.ap
->lock
, flags
);
103 if (stat
->stat
== SAS_PROTO_RESPONSE
) {
104 ata_tf_from_fis(resp
->ending_fis
, &dev
->sata_dev
.tf
);
105 qc
->err_mask
|= ac_err_mask(dev
->sata_dev
.tf
.command
);
106 dev
->sata_dev
.sstatus
= resp
->sstatus
;
107 dev
->sata_dev
.serror
= resp
->serror
;
108 dev
->sata_dev
.scontrol
= resp
->scontrol
;
109 dev
->sata_dev
.ap
->sactive
= resp
->sactive
;
110 } else if (stat
->stat
!= SAM_STAT_GOOD
) {
111 ac
= sas_to_ata_err(stat
);
113 SAS_DPRINTK("%s: SAS error %x\n", __FUNCTION__
,
115 /* We saw a SAS error. Send a vague error. */
117 dev
->sata_dev
.tf
.feature
= 0x04; /* status err */
118 dev
->sata_dev
.tf
.command
= ATA_ERR
;
122 qc
->lldd_task
= NULL
;
124 spin_unlock_irqrestore(dev
->sata_dev
.ap
->lock
, flags
);
127 list_del_init(&task
->list
);
131 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd
*qc
)
134 struct sas_task
*task
;
135 struct domain_device
*dev
= qc
->ap
->private_data
;
136 struct sas_ha_struct
*sas_ha
= dev
->port
->ha
;
137 struct Scsi_Host
*host
= sas_ha
->core
.shost
;
138 struct sas_internal
*i
= to_sas_internal(host
->transportt
);
139 struct scatterlist
*sg
;
140 unsigned int num
= 0;
141 unsigned int xfer
= 0;
143 task
= sas_alloc_task(GFP_ATOMIC
);
145 return AC_ERR_SYSTEM
;
147 task
->task_proto
= SAS_PROTOCOL_STP
;
148 task
->task_done
= sas_ata_task_done
;
150 if (qc
->tf
.command
== ATA_CMD_FPDMA_WRITE
||
151 qc
->tf
.command
== ATA_CMD_FPDMA_READ
) {
152 /* Need to zero out the tag libata assigned us */
156 ata_tf_to_fis(&qc
->tf
, (u8
*)&task
->ata_task
.fis
, 0);
157 task
->uldd_task
= qc
;
158 if (is_atapi_taskfile(&qc
->tf
)) {
159 memcpy(task
->ata_task
.atapi_packet
, qc
->cdb
, qc
->dev
->cdb_len
);
160 task
->total_xfer_len
= qc
->nbytes
+ qc
->pad_len
;
161 task
->num_scatter
= qc
->pad_len
? qc
->n_elem
+ 1 : qc
->n_elem
;
163 ata_for_each_sg(sg
, qc
) {
168 task
->total_xfer_len
= xfer
;
169 task
->num_scatter
= num
;
172 task
->data_dir
= qc
->dma_dir
;
173 task
->scatter
= qc
->__sg
;
174 task
->ata_task
.retry_count
= 1;
175 task
->task_state_flags
= SAS_TASK_STATE_PENDING
;
176 qc
->lldd_task
= task
;
178 switch (qc
->tf
.protocol
) {
180 task
->ata_task
.use_ncq
= 1;
182 case ATA_PROT_ATAPI_DMA
:
184 task
->ata_task
.dma_xfer
= 1;
188 if (sas_ha
->lldd_max_execute_num
< 2)
189 res
= i
->dft
->lldd_execute_task(task
, 1, GFP_ATOMIC
);
191 res
= sas_queue_up(task
);
195 SAS_DPRINTK("lldd_execute_task returned: %d\n", res
);
198 return AC_ERR_SYSTEM
;
204 static u8
sas_ata_check_status(struct ata_port
*ap
)
206 struct domain_device
*dev
= ap
->private_data
;
207 return dev
->sata_dev
.tf
.command
;
210 static void sas_ata_phy_reset(struct ata_port
*ap
)
212 struct domain_device
*dev
= ap
->private_data
;
213 struct sas_internal
*i
=
214 to_sas_internal(dev
->port
->ha
->core
.shost
->transportt
);
217 if (i
->dft
->lldd_I_T_nexus_reset
)
218 res
= i
->dft
->lldd_I_T_nexus_reset(dev
);
221 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __FUNCTION__
);
223 switch (dev
->sata_dev
.command_set
) {
224 case ATA_COMMAND_SET
:
225 SAS_DPRINTK("%s: Found ATA device.\n", __FUNCTION__
);
226 ap
->device
[0].class = ATA_DEV_ATA
;
228 case ATAPI_COMMAND_SET
:
229 SAS_DPRINTK("%s: Found ATAPI device.\n", __FUNCTION__
);
230 ap
->device
[0].class = ATA_DEV_ATAPI
;
233 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
235 dev
->sata_dev
.command_set
);
236 ap
->device
[0].class = ATA_DEV_ATA
;
240 ap
->cbl
= ATA_CBL_SATA
;
243 static void sas_ata_post_internal(struct ata_queued_cmd
*qc
)
245 if (qc
->flags
& ATA_QCFLAG_FAILED
)
246 qc
->err_mask
|= AC_ERR_OTHER
;
250 * Find the sas_task and kill it. By this point,
251 * libata has decided to kill the qc, so we needn't
252 * bother with sas_ata_task_done. But we still
253 * ought to abort the task.
255 struct sas_task
*task
= qc
->lldd_task
;
256 struct domain_device
*dev
= qc
->ap
->private_data
;
258 qc
->lldd_task
= NULL
;
260 task
->uldd_task
= NULL
;
261 __sas_task_abort(task
);
264 sas_phy_reset(dev
->port
->phy
, 1);
268 static void sas_ata_tf_read(struct ata_port
*ap
, struct ata_taskfile
*tf
)
270 struct domain_device
*dev
= ap
->private_data
;
271 memcpy(tf
, &dev
->sata_dev
.tf
, sizeof (*tf
));
274 static void sas_ata_scr_write(struct ata_port
*ap
, unsigned int sc_reg_in
,
277 struct domain_device
*dev
= ap
->private_data
;
279 SAS_DPRINTK("STUB %s\n", __FUNCTION__
);
282 dev
->sata_dev
.sstatus
= val
;
285 dev
->sata_dev
.scontrol
= val
;
288 dev
->sata_dev
.serror
= val
;
291 dev
->sata_dev
.ap
->sactive
= val
;
296 static u32
sas_ata_scr_read(struct ata_port
*ap
, unsigned int sc_reg_in
)
298 struct domain_device
*dev
= ap
->private_data
;
300 SAS_DPRINTK("STUB %s\n", __FUNCTION__
);
303 return dev
->sata_dev
.sstatus
;
305 return dev
->sata_dev
.scontrol
;
307 return dev
->sata_dev
.serror
;
309 return dev
->sata_dev
.ap
->sactive
;
315 static struct ata_port_operations sas_sata_ops
= {
316 .port_disable
= ata_port_disable
,
317 .check_status
= sas_ata_check_status
,
318 .check_altstatus
= sas_ata_check_status
,
319 .dev_select
= ata_noop_dev_select
,
320 .phy_reset
= sas_ata_phy_reset
,
321 .post_internal_cmd
= sas_ata_post_internal
,
322 .tf_read
= sas_ata_tf_read
,
323 .qc_prep
= ata_noop_qc_prep
,
324 .qc_issue
= sas_ata_qc_issue
,
325 .port_start
= ata_sas_port_start
,
326 .port_stop
= ata_sas_port_stop
,
327 .scr_read
= sas_ata_scr_read
,
328 .scr_write
= sas_ata_scr_write
331 static struct ata_port_info sata_port_info
= {
332 .flags
= ATA_FLAG_SATA
| ATA_FLAG_NO_LEGACY
| ATA_FLAG_SATA_RESET
|
333 ATA_FLAG_MMIO
| ATA_FLAG_PIO_DMA
| ATA_FLAG_NCQ
,
334 .pio_mask
= 0x1f, /* PIO0-4 */
335 .mwdma_mask
= 0x07, /* MWDMA0-2 */
336 .udma_mask
= ATA_UDMA6
,
337 .port_ops
= &sas_sata_ops
340 int sas_ata_init_host_and_port(struct domain_device
*found_dev
,
341 struct scsi_target
*starget
)
343 struct Scsi_Host
*shost
= dev_to_shost(&starget
->dev
);
344 struct sas_ha_struct
*ha
= SHOST_TO_SAS_HA(shost
);
347 ata_host_init(&found_dev
->sata_dev
.ata_host
,
349 sata_port_info
.flags
,
351 ap
= ata_sas_port_alloc(&found_dev
->sata_dev
.ata_host
,
355 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
359 ap
->private_data
= found_dev
;
360 ap
->cbl
= ATA_CBL_SATA
;
361 ap
->scsi_host
= shost
;
362 found_dev
->sata_dev
.ap
= ap
;